Because in the repl you're using a thread-local value of *data-readers*,
not the var root, this is because the repl is executed under (binding
[*data-readers ..] ..)
If you try to set! *data-readers* instead, you'll see what you expect.
Consider:
user=> (def ^:dynamic x nil)
#'user/x
user=> x
nil
user=> (binding [x 2] (alter-var-root #'x (constantly 1)) x)
2
user=> x
1
user=> (binding [x 2] (set! x 3) x)
3
user=> x
1
Nicola
Kevin webster writes:
> Can someone explain why this is not altering the *data-readers* dynamic
> var? Does this work for anyone else? Using 1.6.0
>
> (assert (= {} *data-readers*))
> ;; nil
>
> (alter-var-root (var *data-readers*) (fn [_] {:test 2}))
> ;; {:test 2}
>
> (assert (= {:test 2} *data-readers*))
> ;; AssertionError
>
> (assert (= {:test 2} (alter-var-root (var *data-readers*) identity)))
> ;; nil
>
> Thanks!
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